Balloon guard



Dec. 1, 1953 c. B. KINGSBURY 2,660,856

BALLOON GUARD Filed Sept. 29, 1949 3 Sheets-Sheet 1 I N V EN TOR.

Omomcz 3. l nvssaaei Dec. 1, 1953 c. B. KINGSBURY 2,660,856

BALLOON GUARD Filed Sept. 29, 1949 3 Sheets-Sheet 2 INVEN TOR. C/mmwczB. Kmaaauay.

Dec. 1, 1953 c. B. KINGSBURY BALLOON GUARD 3 Sheets-Sheet 3 Filed Sept.29. 1949 R m W W.

Patented Dec. 1, 1953 BALLOON GUARD Chadwick B. Kingsbury, Elizabethtcn,Tenn., as-

signor to North American Rayon Corporation, New York, N. Y., acorporation of Delaware Application September 29, 1949, Serial No.118,646

13 Claims.

1 This invention relates to improvements in twisting machines and moreparticularly to twisting devices wherein the thread or yarn under-.

going twisting forms a so-called balloon, around, and in spaced relationto the yarn package.

One object of the invention is to provide an improved guard for thethread balloon adapted at the same time to permit constant visualinspection of the balloon.

Another object is to provide a balloon guard which, in addition toenclosing and protecting the balloon, is also adapted by the shape,arrangement and action of its structural parts, not only to increase ordecrease the yarn tension exerted by the balloon but also to control thetwist concentration in specific areas of the yarn Without affecting thefinal twist as a whole.

A further object is to provide a balloon guard of collapsible formadapted for use on textile machines of any type where a thread balloonis produced and to mount the guard in such fashion on the textilemachine so as to permit free access to the operating parts of themachine when the guard is collapsed and retracted from the zone ofoperations and also permit quick resetting of the guard into itsoperative position.

An additional object is so to constitute the collapsible guard that,when'in collapsed form, it will occupy an irreducible minimum of spaceand lie substantially outside the zone of servicing operations conductedon the spindle or the like with which it is associated, withoutnecessitating its removal from the machine.

Although the invention is applicable to textile devices where thethread, yarn, or'the like forms a balloon during its travel, it isparticularly suited for twisting spindles, and its construction and usewill be described by way of a non-limiting embodimental example asapplied to such a spindle.

In the operation of certain types of twisting spindles, especiallydouble twist spindles, the

spindle per se revolves but the yarn package from which the yarn isdrawn does not. The yarn that is to be twisted is withdrawn from astationary package carried by the spindle, passes downwardly through thehollow center of the spindle, emerges from a port in a storage wheelatthe lower end and then passes outwardly around, upwardly, in spacedrelation to the spindle in the form of a so-called balloon, the twistedthread then passing to a suitable take-up'device to form thefinishedpackage. The size of the balloon depends upon a number of factors suchas the rotational speed ofthe spindle, the speed of.

H thread take-up at the package and upon the denier of'the'threadundergoing twisting.

Inasmuch as the yarn or thread balloon whirls.

around the spindle the balloon, when extended to its maximum, willstrike against any obstruction it encounters, for example against theballoons produced by adjacent spindles. For this reason it is customaryto place partitions or separators between the spindles, the balloon ofeach spindle thus being, in effect, housed in an enclosure closed onthree sides and open at the front, top, and bot-. tom. An enclosure orcompartment constituted of such partitions or walls however protects theballoon only on three sides. Inasmuch as the balloon constitutes ameans, supplementary to tensioning devices associated with the spindle,for controlling the tension of the yarn, frictional contact of theballoon with any object wouldobviously influence the action of theballoon in its tension-controlling action. If the frictional contact ofthe balloon with extraneous objects could be properly controlled, itcould be used as an additional tension control means. The balloonhowever strikes the flat walls of the enclosure in substantiallytangential fashion, that is, merely at one point, and such contact isinsufficient to exert any useful effect on the tension-controllingproperties of the balloon. In addition, it is inconvenient andtime-consuming to dismantle such enclosures during servicing operations.

Attempts have also been made to provide rigid balloon guards of variousconfigurations and to mount these on moving members of the twisting orother machine, e. g. the ring rail, so as *1. to have the guard move upand down with the latter while protecting the balloon. An embodiment ofsuch a guard constituted as a rigid conical wire cage is disclosed forexample in German Patent No. 169,170 of 1906 to Weber et al., in whichcase however it is used in combination with a ring traveler about whichthe yarn is draped in multiple snubbing fashion, the purpose of theguard being to limit the centrifugal pull exerted on the thread so as toprevent undesirable oscil- I: latory movements of the thread.

In these prior art proposals however the rigid guard must be removedbodily when servicing operations are conducted on the spindle. Inaddition the temporary storing of a large number of such rigidguards,when removed from the machines, is very inconvenient and time-wasting,and they are easily damaged during handling and storage.

In accordancewith the invention, a collapsible guard is provided made ofresilient material coiled so as to produce a balloon-encompassingenclosure of suitable configuration which normally tends to assume acollapsed condition but which can be stretched out and locked inextended condition for use as a rigid guard until it is desired toremove it from the zone of operations as by'unlocking and collapsing thesame, the guard therefore remaining on the machine.

In another embodiment the same type of guard is adapted to serve as aflexible guard with one end permanently attached to a stationary portionof the machine and with the other end detachably locked to a verticallyreciprocating part of said machine thus providing a guard' tha't expandsand contracts in accordance With the moving part of the machine, suchguard being also adapted to be collapsed at anytime and locked incollapsed condition as a fiat, condensed structure away from the zone ofoperations, without stopping the mcahine.

-Several embodiments of the collapsible guard of the invention areillustrated bywayof example the accompanying drawing, where Fig. '1 is aside elevation of a twisting spindle provided with a icylindricallyshaped downwardly collapsibie balloon guard of the type that does notexpand and contract during operation of the spindle, the guard beingshown locked in extended, operative condition.

Fig. 2 shows the :balloon guard of Fig. l in collapsed inoperativecondition, retracted from the zone of operation.

Fig. 3 shows a detail of a support for holding the balloon guard of Fig.l in place.

Fig. i is a cross-section through another portion of the support.

Fig. 5 shows a twisting spindle provided with an upwardly collapsibleballoon guard of the type that also does not expand and contract duringoperation of the spindle, the guard being shaped substantially like theballoon and bein shown locked in extended, operative position.

Fig. 6 shows the balloon guard of Fig. 5 locked in collapsed inoperativeposition, retracted from the zone of operation.

Fig. -7 shows a collapsible balloon guard of the type which flexes orexpands and contracts during operation, the same being shown applied toa ring twister spindle.

Fig. 8 is a view partly in section taken on line 8-8 of Fig. 7 showingmeans for locking the guard to the ring rail of the twister.

Fig. 9 depicts the balloon guard of Fig. 8 locked in collapsed,inoperative position with respect to the spindle.

Referring to the drawing, the balloon guard in all of the figures isconstituted .as a collapsible structure composed of helical convolutionsof resilient material, preferably spring steel, although it may also bemade of any resilient synthetic resin or springy plastic. In theembodiments used for illustrating the invention, the material of whichthe convolutions are formed is shown as of round cross-section, butresilient convolutions of flat or other cross section may also be used.These convolutions are generally designated 1 in the several viewsReferring in detail to the drawing, the balloon guard in Figs. 1 to 6inclusive is shown applied to a conventional two-for-one twisterspindle. The latter consists, as usual, of the spindle per se, 2, thegatherin wheel 3, drive belt 4, and idler pulley 5 mounted on supportrail 6. Above the gathering wheel 3 is disposed the bowl I which servesas a support for the supply package 8 from.

d which the yarn to be twisted is drawn, said package in this type oftwister being caused to remain substantially stationary with respect toie spindle (except for occasional gyratory movements) bycounterbalancing means (not shown) within the spindle. The spindle issupported on a right-angled arm 9 pivotally carried by a bracket 11!attached to the machine. The numeral H designates a braking device. Amember 12 of frusto-conical shape surmounts the yarn package 8 andcarries a top member it on the upper surface of which reposes a tensioncontrolling weight M. A passage extends centrally through the interiorof the spindle and communicates with radially directed passages in thegathering Wheel 3 thatterminates in ports (not indicated) through one ofwhich the yarn issues. The yarn drawn from supply package 8 passes inthe direction of arrow 55 beneath the tensioning weight M, down throughthe central passage in the spindle and emerges from the aforesaid portin thegathering wheel ii and then forms the yarn balloon which isindicated in the gures, as if stroboscopicallyviewed -or frozen inspace, by the line marked 5:6. The yarn proceeds, as indicated by arrowH, to the guide eye 58 (Fig.1) and thence to the take-up device 1-9.

In Fig. 1 the balloon guard is of the type that does not flex up anddown during operation of the spindle, that is, once the guard isextended so as to encompass the spindle, it remains in that conditionuntil deliberately allowed to collapse. Asshown inFigs. l .and'2 it isof the downwardly collapsible type. The guard is supported at its lowerend, in spaced reation to the spinde, by a ring-like member "20 whichterminates in the portion 2! carried by the bracket 9 as at 22. Theupper end of the guard is detachably retained by a suitable lockingdevice. In the embodiment shown a suitable arrangement for the purposecomprises a block 23 provided with a lateral opening for inserting a lugiii of a ring '26, that carries the upper terminal convolution of theguard. The lug BI is provided with notches 2?, 28 (Fig. 2i for engagingwith locking means such as rods or balls 29, '30 housed inside the block23. In lieu of ring 26 the topmost terminal convolution itself may bebent off laterally and provided with notches. The locking device 23 iscarried by an arm 32 attached to the upper end of the spindle-supportingbracket 9. It is apparent that when the lug at of the ring 26 (or thebentofi end of the notched terminal convolution per se) is inserted intoblock 23 it will act as a lever with fulcrum at 29, operated by theweight of the guard and the springy pull exerted by the latter when inextended position. Obviously any ot er suitable means may be used forlocking the guard in extended position. It is also apparent thattheguard can be instantly released from the position shownin Fig. 1 so asto cause it to collapse downwardly to the position shown in Fig. 2 inwhich latter position it is completely out of the zone of any servicingoperations conducted on the supply paokage and the upper portion of thespindle. When drawn out into extended position, (Fig. l), the guardencompasses the spindle in spaced relation thereto and shields the yarnballoon from injury.

Figs. 5 and 6 show an embodiment of the same guard wherein, however, thelatter is collapsible in an upward direction. In this case the spindleparts are the same as those of Figs. 1-4 and bear thesame referencenumerals and the balloon 16 is formed in the same manner as heretofore.In

5 this case, however, the guard is permanently attached to the guide eye33 disposed above the spindle, said guide eye being carried by a bracket3 attached to the spindle-supporting bracket 9. The lower end of theguard i is carried by an annular member having an outwardly extendingarm for cooperation with a locking device 37 attached to bracket 9, saidlocking device operating sin -iy to the same type of device 23 shown inFig. l. Asshown in Fig. 5 the guard is in drawn-out, locked, operativecondition, disposed in spaced relation to the spindle, in position toprotect the balloon. When the guard is to be collapsed, the arm 35 iswithdrawn from the locking device Bl allowing the guard to collapseupwardly into the position shown in Fig. 6, thus removing it from thezone of operations about the spindle. In order to prevent possible upand down oscillation of the collapsed guard, another locking device 3711may be provided slightly above the spindle, for example on arm Ed, saiddevice being also similar in construction to devices and ill.

In Figs. 7 to 1d the guard is of a type suitable for use with machineswherein an operative member, e. g. a ring rail is reciprocated withrespect to a spindle, spool, package or the like, where a yarn balloonis formed which must be protected. and where the guard must of necessityexpand and contract to a certain extent in accordance with the movementof such reciprocating memher while still providing a balloon-protectingenclosure.

In these figures the guard is shown applied, for example, to a ringtwister. The numeral 33 designates the spindle and bobbin assembly onwhich the twisted yarn is to be wound. This is driven, as usual, by thepulley cc and belt 4!. The numeral is the ring rail to which the ring4-3 is attached in coaxial relation to the spindle assembly, a ringbeing provided for each spindle assembly. Each ring it is equipped witha ring traveler M. The yarn passes in the direction of arrow 52 from asource of supply (not shown) at the top, through the guide eye 39, aboutthe traveler ii and is wound up on the bobbin 38 in finished, twistedcondition. During this 0 .eration the ring 63 and traveler 44 are ofcourse moved up and down by ring rail 42 as indicated by arrow 65.During its travel the yarn forms the balloon. indicated by it, asbefore. The balloon guard. i, which is preferably of a shapesubstantially similar to that of the balicon, is permanently attached atits upper end to the eye 35', 57. The lower end of the guard is carriedby an annular member 55 which is detachably locked to the it, forexample by a suitable spring locking arrangement :53. Since the ring 43is rigidly associated with the ring rail 52 and the annular member :8 islatched to the ring 33 by the locking device 48, the balloon guard willexpand and contract as the ring rail moves up and down. When the guardis to be collapsed and retracted out of the operative zone of thespindle, the annular guard--retaining member Q6 is unfastened from thering 43 by manipulating the lock 48; the guard is then able to collapseupwardly and assumes the position shown in Fig. 9.

To prevent up and down oscillation of the guard if relatively softspringy material is used, or if the springiness of the guard hasdecreased, it is preferable to lock it in collapsed condition. For thispurpose a locking arrangement 49 may be used, similar to those shown inFig. 5 (refwhich is carried by a bracket ill erence numeral 31a). Anextension 59 on the guard retaining member 46 is adapted to be locked inthe member 49 by balls or rods 29, 3d as hereinbefore described. In lieuof using an annular member such as it for manipulating the uard, the endof the bottom terminal convolution maybe bent oil laterally and used inlieu of extension 58 for locking the guard in collapsed condition.Obviously the number of convolutions constituting the guard must besumcient, when the guard is being drawn out and retracted by themovement of the ring rail, so as always to provide a protectiveenclosure about said balloon.

The guard of the invention has been described herein, merely forillustrative purposes, as applied to twisting spindles of thedownstroke, e. g. ring-twister type, and to spindles wherein the twistis imparted by the spindle per se as it retates, e. g. in the case ofthe spindles shown in Figs. 1 and 5. However it is obvious that theguard is also advantageously applicable to conventional up-stroizetwisters where, for example, the supply package serves to insert thetwist as it revolves, and, in general, to any textile machine where atrue balloon is formed by the yarn or thread during the operation of themachine.

In addition to acting as a means for protecting the yarn balloonfromdamage, the guard also serves as a means for restricting thediameter of the balloon on twisting spindles, especially when yarn ofvery heavy denier is being twisted at high spindle speeds. In case ofconventional or open and unrestricted balloons, very low spindle speedswould have to be usedto prevent the balloon from slapping heavily intangential fashion against the flat walls of the enclosures heretoforeused. In the case of the guard herein described however the latter ispreferably substantially of the same shape as the balloon and the yarntherefore contacts against a large portion of the inside walls of theenclosure and is thus effectively restricted.

In accordance with another feature of the invention the guard serves asa tension controlling means supplementary to other yarn tensioningdevices that may be used on or within the spindie and even supplementingthe tension controlling action exerted by the balloon per se when notenclosed by a guard. Thus if the helical structure of the guard iscoiled along the spiral direction in which the thread travels, the guardserves to urge the thread in its direction of flow and thus serves toreduce the balloon tension. On the other hand, if the guard is coiledalong a spiral direction opposite that in which the thread travels, theguard serves to retard the thread in its direction of flow and thus toincrease the balloon tension.

The guard is also adapted to control the twist concentration in specificareas of the yarn. Thus, in constructing the guard, the helicalconvolutions are coiled along the spiral direction in which the yarn orthread travels, the guard acts to urge the twist in the direction ofyarn flow and thus serves to reduce the twist concentration between thespindle and the point of contact of the yarn with the guard. Likewise,if the guard is coiled along a spiral direction opposite that in whichthe yarn travels, the guard serves to retard the flow of twist and thusacts to increase twist concentration between the spindle and the pointof contact of the yarn with the guard.

The guard herein described permits constant visual inspection of theballoon and of the packtionaliy be transparent ir age from which theyarn is withdrawn if the guard is used on double twist spindles orconventional upstroke spindles (not shown in the drawing) and likewiseof the balloon and the bobbin, if the guard is used on a ring twister orany other device where a balloon is formed. A readily available materialfor constituting the guard is heavy round spring steel wire, but thehelical guard may with equal advantage be formed from fiat strip steelor material of any suitable cross section. Suitable synthetic plasticsadaptable for constituting the convolutions of the guard may also beused and such plastics may addidesired, for example in order to avoidgaps in the continuity of the image of the balloon when viewed with astroboscope or otherwise. The material of which the guard is constitutedas well as the mode of forming and treating the convolutions may be suchas to cause the finished guard to possess sufficient retractibility(after it is drawn out) to collapse of its own accord so as to form arelatively thin, tightly condensed, cake-like structure, in which caseit need not necessarily be locked in collapsed condition. iowever, ifformed so as not to be collapsible of its own accord, or in cases wherecontinuous flexing tends to reduce its inherent selfcollapsing power,suitable means may be provided for looking it in collapsed condition asshown herein to prevent undesirable up and down oscillations thereofwhen servicing operations are being performed on the machine. When incollapsed condition the guard occupies a minimum of space away from theoperative zone of the spindle or other parts of the machine. Inasmuch asit is adapted to remain on the machine with which it is to be used andis out of the way when not in use, it u i1 not become mislaid or damagedand hence presents no storage problem.

In the preferred embodiment, one end of the 4 guard is permanentlyattached to a portion of the machine, the other end being detachablysecured to another portion of the machine. If desired, however, each endof the guard may be detachably secured so as to permit it to be bothcollapsed and completely removed from the machine, but even in such casethe collapsed, removed guard is of such small compass as to present noservicing difficulties.

I claim:

1. In a twisting spindle wherein yarn, thread, or the like forms aballoon during its travel, the provision of a guard for enclosing andprotecting said balloon, said guard being longitudinally collapsible butcapable of being manually moved to an extended condition to provide anenclosure for said yarn, and while in collapsed condition affording freeaccess to the operating zone of the spindle where the ballon. is formed.

2. In a twisting device wherein yarn, thread, or the like forms aballoon about a spindle, spool, package or the like, the provision of aguard for said balloon, said guard comprising a structure constituted ofhelically coiled convolutions of resilient material movable from anextended position forming a protective enclosure about said balloon to acollapsed position afiording free access to the operating zone of thespindle where the balloon is formed, said guard being selfbiasing to oneof its positions, and means for holding it in the other position.

3. In a twisting device wherein yarn, thread, or the like forms aballoon about a spindle, spool, package or the like, the provision of aguard for said balloon, said guard comprising a collapsible structureconstituted of helically coiled convolutions of resilient materialadapted when extended to form a protective enclosure about said balloon,

means on said twisting device for permanently retaining one end of saidguard, means on another portion of said twisting device for detachablysecuring the the other end of said guard when in extended condition, andmeans on said twisting device disposed at a point remote from saidsecond means and adapted for detachably retaining said guard when incollapsed condition.

4. In a twisting device wherein yarn, thread, or the like forms aballoon about a spindle, spool, package or the like, and wherein saidtwisting device contains a stationary member and a reciprocating member,the provision or" a guard for said balloon, said guard comprising acollapsible structure constituted of helically coiled convolutions ofresilient material, one end of said guard being attached to saidstationary member of said twisting device and the other end beingattached to said reciprocating member for enabling said end to followthe movements of said reciprocating member, the number of convolutionsconstituting said guard being sufiicient when one end of said guard isextended by the movement of said reciprocating member so as always toprovide a protective enclosure about said balloon.

5. In a twisting device wherein yarn, thread, or the like forms aballoon about a spindle, spool, package or the like, and wherein saidtwisting device contains a stationary member and a reciprocating member,the provision of a guard for said balloon, said guard comprising acollapsible structure constituted of helically coiled convolu tions ofresilient material, one end of said guard being attached to saidstationary member of said twisting device and the other end beingattached to said reciprocating member for enabling said end to followthe movements of said reciprccat ing member, the number of convolutionsconstituting said guard being sufiicient when one end of said guard isextended by the movement of said reciprocating member so as always toprovide a protective enclosure about said balloon, one end of said guardbeing detachable from its place of attachment and adapted when releasedto permit said guard to collapse towards the other point of attachmentand means at said other point of attachment adapted to lock said guardin collapsed condition out of the operative zone of said twistingdevice.

6. A balloon guard for twisting spindles comprising an enclosure ofsubstantially the same shape as the balloon and formed by extending aspringy coiled structure constituted of helically wound convolutions ofresilient material from a point of first attachment to a second point ofattachment, said guard being collapsible so as to occupy a minimum ofspace when not in use as an enclosure.

'7. A balloon guard for twisting spindles comprising an enclosure ofsubstantially the same shape as the balloon and formed by extending aspringy coiled structure constituted of helically wound convolutions ofresilient material, said guard being collapsible so as to occupy aminimum of space when not in use as an enclosure, and means for lockingsaid guard in extended condition.

8. .A balloon guard for twisting spindles com prising an enclosure ofsubstantially the same shape as the ballooon and formed by extending aspringy coiled structure constituted of helically wound convolutions ofresilient material, said 9 guard being collapsible so as to occupy aminimum of space when not in use as an enclosure, means for locking saidguard in extended condition, and means for locking said guard incollapsed condition when said first means is released.

9. In a twisting spindle assembly wherein yarn, thread, or the likeforms a balloon about a spindle, spool, package or the like and whereinthe tension of the yarn, thread or the like is controlled by meanswithin the spindle and by the balloon per se, the provision of a guardfor said balloon adapted to protect said balloon from injury and at thesame time to serve as an additional means for controlling the tension ofthe yarn, thread or the like, said guard comprising a collapsiblestructure constituted of helically coiled convolutions of resilientmaterial adapted when extended to form a protective enclosure about saidballoon the shape of said enclosure being substantially the same as thatof the balloon, the striking of said balloon against said enclosureserving to exert a uniform frictional drag on substantially all pointsof said balloon to serve as an additional means exterior of said spindlefor controlling the tension of said yarn, thread or the like, and meansfor securing said guard at two points removed from each other.

10. In a twisting spindle wherein yarn, thread,

or the like forms a balloon about a spindle, a

spool, package or the like and wherein the tension of the yarn, threador the like is controlled by means within the spindle and by the balloonper se, the provision of a guard for said balloon adapted to protectsaid balloon from injury and at the same time to serve as an additionalmeans for controlling the tension of the yarn, thread or the like, saidguard comprising a collapsible structure constituted of helically coiledconvolutions of resilient material adapted when extended to form aprotective enclosure about said balloon, the shape of said enclosurebeing substantially the same as that of the balloon, the striking ofsaid balloon against said enclosure serving to exert a uniformfrictional drag on substantially all points of said balloon to serve asan additional means exterior of said spindle for controlling the tensionof said yarn, thread or the like, the convolutions of said guard beingcoiled in the same spiral path of travel of the thread, yarn or the likeand serving to reduce the tension exerted by the balloon.

11. In a twisting spindle wherein yarn, thread, or the like forms aballoon about a spindle, spool, package or the like and wherein thetension of the yarn, thread or the like is controlled by means withinthe spindle and by the balloon per se, the provision of a guard for saidballoon adapted to protect said balloon from injury and at the same timeto serve as an additional means for controlling the tension of the yarn,thread 10 V. or the like, said guard comprising a collapsible structureconstituted of helically coiled convolutions of resilient materialadapted when extended to form a protective enclosure about said balloon,the shape of said enclosure being substantially the same as that of theballoon, the striking of said balloon against said enclosure serving toexert a uniform frictional drag on substantially all points of saidballoon to serve as an additional means exterior of said spindle forcontrolling the tension of said yarn, thread or the like, theconvolutions of said guard being coiled in a direction opposite thespiral path of travel of the thread, yarn or the like and serving toincreasing the tension exerted by the balloon.

12. In a twisting device wherein yarn, thread or the like forms aballoon about a spindle, spool, package or the like, the provision of aguard for said balloon, said guard being constituted of an extensiblebut normally collapsed frame-work adapted in extended position to form aprotective enclosure about said balloon, means on said twisting devicefor permanently retaining one end of said enclosure, and means onanother portion of said device for detachably securing the other end ofsaid enclosure when in extended condition.

13. A two-for-one twister assembly comprising in combination a rotatablespindle, a fiyer and yarn storage device fixed to said spindle for rotation therewith, said spindle and storage device being formed fordelivery of yarn therethrough, a supply package support carried by saidspindle above said fiyer, stabilizing means preventing rotation of saidsupport with said spindle, pretensioning means carried by said support,and means surrounding said support and spaced therefrom acting inconjunction with said storage device to provide tension-shape control ofthe yarn balloon formed during rotation of the spindle when yarn isdrawn from a yarn supply package on said support through saidpretensioning means, through the spindle and storage device, upwardlyfrom said fiyer and between said last mentioned means and said support.

CHADWICK B. KINGSBURY.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,449,928 Addis Mar. 27, 1923 1,786,235 Gariepy Dec. 23, 19302,081,416 Vicq May 25, 1937 FOREIGN PATENTS Number Country Date 13,269Great Britain of 1905 346,003 France Nov. 8, 190&

